When it comes to synonyms for the word "polariser," there are a few options that can convey a similar meaning. One such synonym is "polarizing filter," which refers to a colored or neutral filter that helps to eliminate reflections and glare in photographs or other visual media. Another option is "polarizing agent," which can refer to a substance or chemical that causes the separation of polar molecules or ions. Finally, "divider" can also be used as a synonym for "polariser," though in this case it refers to a device or tool that helps to separate or divide materials or substances based on their properties.